EP1881657A1 - Procédé et appareil pour évaluer l'état d'un lien radio dans un système à réseau à commutation par paquets - Google Patents

Procédé et appareil pour évaluer l'état d'un lien radio dans un système à réseau à commutation par paquets Download PDF

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Publication number
EP1881657A1
EP1881657A1 EP07014416A EP07014416A EP1881657A1 EP 1881657 A1 EP1881657 A1 EP 1881657A1 EP 07014416 A EP07014416 A EP 07014416A EP 07014416 A EP07014416 A EP 07014416A EP 1881657 A1 EP1881657 A1 EP 1881657A1
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EP
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Prior art keywords
condition
sub
predetermined
time period
during
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Withdrawn
Application number
EP07014416A
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German (de)
English (en)
Inventor
Young-Bum Kim
Ju-Ho Lee
Joon-Young Cho
Seong-Hun Kim
Gert Jan Van Lieshout
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Publication of EP1881657A1 publication Critical patent/EP1881657A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements

Definitions

  • the present invention generally relates to a Packet-Switched (PS) network system. More particularly, the present invention relates to a method and apparatus for estimating radio link status.
  • PS Packet-Switched
  • a Mobile Station (MS) or a Base Station (BS) determines if a Radio Link Failure (RLF) has occurred by monitoring the radio link status and operates accordingly.
  • MS Mobile Station
  • BS Base Station
  • a conventional Wideband Code Division Multiple Access (WCDMA) system estimates the channel status using a Dedicated Physical Control Channel (DPCCH) or uses the Cyclic Redundancy Check (CRC) check result of a Dedicated Physical Data Channel (DPDCH).
  • DPCCH Dedicated Physical Control Channel
  • CRC Cyclic Redundancy Check
  • an 'out-of-sync' state and an 'in-sync' state are defined, and an out-of-sync indicator or an in-sync indicator is generated in the physical layer and reported to an upper layer.
  • the out-of-sync indicator and the in-sync indicator are created according to the following rules.
  • the MS or the BS determines the RLF and discontinues DPCCH and DPDCH transmission.
  • the other party i.e. the receiver, fails to receive the DPCCH or the DPDCH and thus generates the out-of-sync indicator according to the out-of-sync generation rule. If this state lasts until a predetermined timer expires, the RLF is finally declared.
  • the RLF determination and synchronization process is based on a Circuit-Switched (CS) system in which data or control information is continuously transmitted.
  • CS Circuit-Switched
  • a radio link is established between the MS and the BS, data is continuously transmitted on the DPCCH or the DPDCH and the DPCCH or DPDCH transmission is discontinued in an RLF state.
  • PS Packet-Switched
  • LTE Long Term Evolution
  • An aspect of exemplary embodiments of the present invention is to address at least the problems and/or disadvantages of the prior art and to provide at least the advantages described below. Accordingly, an aspect of exemplary embodiments of the present invention is to provide a radio link status estimation procedure suitable for a PS network system.
  • a method for estimating radio link status in at least one of an MS and a BS in a PS network system which includes monitoring a reception channel status, determining whether the reception channel status satisfies a first condition, an out-of-sync indicator is generated if the reception channel status satisfies the first condition, monitoring the transmission channel status if the reception channel status does not satisfy the first condition, determining whether the transmission channel status satisfies a second condition, an out-of-sync indicator is generated if the transmission channel status satisfies the second condition, and determining that an RLF has occurred and transmission of at least one of data and control information is discontinued, if N or more out-of-sync indicators are generated during a predetermined first time period, N being a natural number.
  • an apparatus for estimating radio link status in a PS network system in which a radio link estimator generates an out-of-sync indicator according to reception channel status or transmission channel status, and determines whether an RLF has occurred based on the generated out-of-sync indicator, and a transmission signal processor receives a control signal according to the determination of the radio link estimator and determines whether to transmit a signal according to the control signal.
  • the radio link estimator determines whether the reception channel status satisfies a first condition, generates an out-of-sync indicator if the reception channel status satisfies the first condition, determines whether the transmission channel status satisfies a second condition if the reception channel status does not satisfy the first condition, generates an out-of-sync indicator if the transmission channel status satisfies the second condition, and determines that the RLF has occurred if N or more out-of sync indicators are generated during a predetermined first time period, N being a natural number, and outputs a control signal commanding discontinuing transmission of at least one of data and control information.
  • Exemplary embodiments of the present invention define an RLF determination and synchronization procedure suitable for use in a cellular PS network system and provide associated operations of a BS and an MS, compared to the conventional RLF determination and synchronization procedure based on a CS system characterized by continuous transmission of data or control information in a WCDMA system.
  • An MS or a BS can estimate a Reception (Rx) radio link status from data or control information received on an Rx channel. That is, the MS or the BS generates an out-of-sync indicator or an in-sync indicator by which to determine an RLF using data or control information for a predetermined monitoring time period.
  • a physical layer creates the out-of-sync indicator or the in-sync indicator according to the following rules and reports the indicator to an upper layer.
  • the control information can be a pilot signal or a Channel Quality Indicator (CQI) representing a channel status.
  • CQI Channel Quality Indicator
  • the monitoring time should be set to be sufficiently long to estimate the radio link status. If the monitoring time is too short, the radio link status is not fully evaluated. If the monitoring time is too long, a change in the radio link status is elusive. In the nature of the PS system, transmission of data or control information may be discontinuous.
  • RLF determination procedure A description will be made of an RLF determination procedure.
  • the RLF determination procedure will be described from the viewpoint of the MS, but it is to be clearly understood that the same RLF determination procedure applies to the BS.
  • FIG. 1 illustrates an operation for determining an RLF based on out-of-sync indicators according to an exemplary embodiment of the present invention.
  • data or control information is transmitted/received normally between the MS and the BS during a time period T1.
  • N_OUTSYNC_IND successive out-of-sync indicators are internally reported in the MS during a time period T2.
  • a timer T_RLFFAILURE is activated to count a time period T3. If N_INSYNC_IND in-sync indicators are reported during the time period T3, the MS resets the timer T_RLFFAILURE, determining that an RLF has not occurred, and then performs a normal transmission/reception.
  • the MS determines that an RLF has occurred upon expiration of the timer T_RLFFAILURE and discontinues transmission of data or control information to the BS.
  • the BS receives no more data or control information from the MS, the BS determines that an RLF has occurred according to the out-of-sync indicator generation rule and the RLF determination procedure.
  • both the MS and the BS make the same decision that the RLF has occurred. That is, RLF synchronization is acquired between the MS and the BS.
  • FIG. 2A is a flowchart illustrating an operation for generating an out-of sync indicator according to an exemplary embodiment of the present invention.
  • the MS or the BS estimates the Rx channel status during a monitoring time period in step 201 and evaluates the estimated Rx channel status in step 202. If the Rx channel status is poor, i.e. below a threshold level, the MS or the BS generates an out-of-sync indicator and reports it to the upper layer in step 203. If the Rx channel status is good, i.e. greater than or equal to the threshold level, the MS or the BS estimates Tx channel status in step 204 and evaluates the estimated Tx channel status in step 205. If the Tx channel status is poor, the MS or the BS generates an out-of-sync indicator and reports it to the upper layer in step 203. If the Tx channel status is good, the MS or the BS ends the out-of-sync generation procedure without generating an out-of-sync indicator.
  • FIG. 2B is a flowchart illustrating an operation for generating an in-sync indicator according to an exemplary embodiment of the present invention.
  • the MS or the BS estimates the Rx channel status during a monitoring time period in step 211 and evaluates the estimated Rx channel status in step 212. If the Rx channel status is good, the MS or the BS generates an in-sync indicator and reports it to the upper layer in step 213. If the Rx channel status is poor, the MS or the BS ends the in-sync indicator generation procedure without generating an in-sync indicator.
  • the monitoring period during which the channel status is monitored to generate an out-of-sync indicator or an in-sync indicator is preset. On a monitoring period basis, an out-of-sync indicator or an in-sync indicator is generated. According to the RLF determination procedure described with reference to FIG. 1, the occurrence or non-occurrence of an RLF is determined using the out-of-sync indicators or in-sync indicators generated in the above procedure.
  • FIG. 3A is a flowchart illustrating an out-of-sync indicator generation operation in the MS according to an exemplary embodiment of the present invention.
  • the MS checks the following conditions to estimate its downlink channel status in step 301 and determines whether Condition 1, Condition 2, or Condition 3 is satisfied in step 302.
  • the time period T, the threshold Qout, and the number N are all preset and the parameters may vary in the conditions.
  • the common channel can be a Broadcast Channel (BCH) or a Paging Channel (PCH).
  • Condition 2 cannot be determined due to the absence of data received a long period of time, the MS can check the common channel instead. Thus, the MS can estimate the downlink channel status by checking the above conditions.
  • step 302 If at least one of the conditions is fulfilled in step 302, which equates to a poor downlink channel status, the MS determines that it is in an out-of-sync state, generates an out-of-sync indicator, and reports the out-of-sync indicator to the upper layer in step 303. Then the MS ends the out-of-sync indicator generation procedure.
  • step 302 If none of the conditions are fulfilled in step 302, which equates to a good downlink channel status, the MS checks Condition 4 or Condition 5 in steps 304 and 305.
  • the MS can estimate its uplink channel status by checking Condition 4 and Condition 5. If the downlink channel status is good and Condition 4 is fulfilled, the MS can determine that the BS has failed to receive the scheduling request information due to a poor uplink channel status. If the downlink channel status is good and Condition 5 is fulfilled, it can be said that the BS has failed to receive data from the MS due to a poor uplink channel status.
  • the MS If at least one of Condition 4 and Condition 5 is fulfilled in step 305, the MS generates an out-of-sync indicator, considering that it is in the out-of-sync state and reports the out-of-sync indicator to the upper layer in step 303. Then the MS ends the out-of-sync indicator generation procedure.
  • step 305 If none of the conditions are fulfilled in step 305, which equates to a good uplink channel status, the MS ends the out-of-sync indicator generation procedure without generating an out-of-sync indicator.
  • FIG. 3B is a flowchart illustrating an in-sync indicator generation operation in the MS according to an exemplary embodiment of the present invention.
  • the MS checks the following conditions and determines whether Condition 1, Condition 2, or Condition 3 is satisfied in steps 311 and 312.
  • the time period T, the threshold Qin, and the number N are all preset and the parameters may vary with the conditions.
  • the MS determines that it is in an in-sync state, generates an in-sync indicator, and reports the in-sync indicator to the upper layer in step 313. Then the MS ends the in-sync indicator generation procedure. If none of the conditions are fulfilled in step 312, the MS ends the in-sync indicator generation procedure.
  • the RLF determination procedure described with reference to FIG. 1 is performed using the out-of-sync indicators or in-sync indicators generated on a monitoring time T basis in the above-described procedure.
  • the MS discontinues transmission of uplink data and control information.
  • the control information can be a channel sounding pilot by which the BS estimates the uplink channel status, a CQI indicating the downlink channel status estimated by the MS, uplink ACK/NACK information indicating the presence or absence of errors in downlink data, etc.
  • the CQI can represent the channel status of a band allocated to the MS by a scheduler or the channel status of a maximum band measurable at the MS.
  • the MS may transmit a preset CQI codeword indicating the RLF occurrence, instead of the CQI.
  • the BS checks the following conditions and determines whether Condition 1, Condition 2, or Condition 3 is satisfied in steps 401 and 402.
  • the time period T, the thresholds Qout_cqi and Qout_pilot, and the number N are all preset and the time T may vary with the conditions.
  • the CQI is a value representing a downlink channel status measured by the MS and reported to the BS.
  • the channel sounding pilot is a pilot signal that the MS transmits so as to enable the BS to estimate the uplink channel status.
  • the BS can estimate the uplink channel status by checking the above conditions.
  • step 402 If at least one of the conditions is fulfilled in step 402, which equates to a poor uplink channel status, the BS determines that it is in an out-of-sync state, generates an out-of-sync indicator, and reports the out-of-sync indicator to the upper layer in step 403. Then the BS ends the out-of-sync indicator generation procedure.
  • step 402 If none of the conditions are fulfilled in step 402, which equates to a good uplink channel status, the BS checks Condition 4, Condition 5, or Condition 6 in steps 404 and 405.
  • the time T is preset and can be set to a different value with each condition.
  • the BS can estimate its downlink channel status by checking Condition 4, Condition 5, and Condition 6. If the uplink channel status is good and Condition 4 is fulfilled, the BS can determine that the uplink channel status is poor.
  • the uplink control information can be scheduling request information in Condition 5. If the uplink channel status is good and Condition 5 is fulfilled, the BS can determine that the MS has discontinued uplink transmission, considering that the downlink channel status is poor. If the uplink channel status is good and Condition 6 is fulfilled, the BS can determine that the MS has failed to receive data from the BS due to a poor downlink channel status.
  • step 405 the BS generates an out-of-sync indicator, considering that it is in the out-of-sync state and reports the out-of-sync indicator to the upper layer in step 403. Then the BS ends the out-of-sync indicator generation procedure. If none of the conditions are fulfilled in step 405, the BS ends the out-of-sync indicator generation procedure without generating an out-of-sync indicator.
  • the BS checks the following conditions and determines whether Condition 1, Condition 2, or Condition 3 is satisfied in steps 411 and 412.
  • the time period T, the thresholds Qin_cqi and Qin_pilot, and the number N are all preset and the parameter T can be set to a different value with the conditions.
  • the BS determines that it is in an in-sync state, generates an in-sync indicator, and reports the in-sync indicator to the upper layer in step 413. Then the BS ends the in-sync indicator generation procedure. If none of the conditions are fulfilled in step 412, the BS ends the in-sync indicator generation procedure.
  • the RLF determination procedure described with reference to FIG. 1 is performed using the out-of-sync indicators or in-sync indicators generated on a monitoring time T basis in the above-described procedure.
  • the control information can be a scheduling grant, downlink ACK/NACK information indicating the presence or absence of errors in uplink data, etc.
  • an Rx signal processor 503 processes a signal received from the BS through an Rx antenna 501 by Fast Fourier Transform (FFT), channel estimation, channel equalization, etc.
  • a Demultiplexer (DEMUX) 505 demultiplexes the processed signal into data, a pilot signal, an ACK/NACK signal, a scheduling grant, and other control signals.
  • a decoder/CRC checker 507 decodes the data received from the DEMUX 505, performs a CRC check on the decoded data, and notifies an RLF decider 517 of the CRC check result. When the decoded data passes the CRC check, it is final data that a user acquires.
  • a pilot processor 509 measures the strength of the pilot signal received from the DEMUX 505 and provides pilot strength measurement to the RLF decider 517.
  • a scheduling grant processor 511 decodes the scheduling grant received from the DEMUX 505 and provides the decoded scheduling grant to a data buffer 519 and a Tx signal processor 521. The scheduling grant processor 511 also notifies the RLF decider 517 of the presence or absence of a scheduling grant.
  • An ACK/NACK processor 513 decodes the ACK/NACK signal received from the DEMUX 505 and provides the decoded ACK/NACK signal to the data buffer 519. The ACK/NACK processor 513 also notifies the RLF decider 517 of the presence or absence of an ACK/NACK signal.
  • An other control signal processor 515 receives a common channel signal from a cell so that the MS can acquire common information, and notifies the RLF decider 517 of the CRC check result of the common channel signal.
  • the RLF decider 517 determines whether an RLF has occurred using the signals received from the decoder/CRC checker 507, the pilot processor 509, the schedule grant processor 511, the ACK/NACK processor 513, and the other control signal processor 515 according to the RLF determination procedure of the MS. If the RLF decider 517 determines that an RLF has occurred, the RLF decoder 517 outputs a control signal commanding the discontinuance of data or control information to the Tx signal processor 521.
  • the data buffer 519 and the Tx signal processor 521 control the amount of transmission data or determine how to map resources using the signals received from the schedule grant processor 521.
  • the data buffer 519 also determines whether to transmit new data or retransmit transmitted data at the next transmission time based on the signal received from the ACK/NACK processor 513.
  • an Rx signal processor 603 processes a signal received from the MS through an Rx antenna 601 by FFT, channel estimation, channel equalization, etc.
  • a DEMUX 605 demultiplexes the processed signal into data, a CQI, a channel sounding pilot, an ACK/NACK signal, and other control signals.
  • a decoder/CRC checker 607 decodes the data received from the DEMUX 605, performs a CRC check on the decoded data, and notifies an RLF decider 617 of the CRC check result. When the decoded data passes the CRC check, it is final data that a user acquires.
  • a CQI processor 609 measures the strength of the CQI signal received from the DEMUX 605, decodes the CQI signal, and provides CQI strength measurement and the decoding result to the RLF decider 617.
  • a channel sounding pilot processor 611 measures the strength of the channel sounding pilot signal received from the DEMUX 605 and provides the measurement to the RLF decider 617.
  • An ACK/NACK processor 613 decodes the ACK/NACK signal received from the DEMUX 605 and provides the decoded ACK/NACK signal to a data buffer 621. The ACK/NACK processor 613 also notifies the RLF decider 617 of the presence or absence of an ACK/NACK signal. An other control signal processor 615 receives scheduling request information from the MS and provides it to a scheduler 619 and the RLF decider 617.
  • the scheduler 619 performs scheduling based on signals received from the decoder/CRC checker 607, the CQI processor 609, the channel sounding pilot processor 611, the ACK/NACK processor 613, the other control signal processor 615, and the data buffer 621. Specifically, the scheduler 619 adjusts the amount of transmission data by controlling the data buffer 621 and the Tx signal processor 623, determines who to map resources to, and determines parameters associated with data transmission from the MS.
  • the RLF decider 617 determines whether an RLF has occurred using the signals received from the decoder/CRC checker 607, the CQI processor 609, the channel sounding pilot processor 611, the ACK/NACK processor 613, and the other control signal processor 615 according to the RLF determination procedure of the BS. If the RLF decider 617 determines that an RLF has occurred, the RLF decoder 617 outputs a control signal commanding the discontinuance of data or control information to the Tx signal processor 623.
  • the data buffer 619 determines whether to transmit new data or retransmit transmitted data at the next transmission time based on the signal received from the ACK/NACK processor 613.
  • the present invention provides a radio link status estimation procedure suitable for a PS network system.
  • a radio link status estimation procedure suitable for a PS network system.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
EP07014416A 2006-07-21 2007-07-23 Procédé et appareil pour évaluer l'état d'un lien radio dans un système à réseau à commutation par paquets Withdrawn EP1881657A1 (fr)

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KR1020060068538A KR20080008801A (ko) 2006-07-21 2006-07-21 패킷 전송 기반 통신 시스템에서 라디오 링크 상태를판단하는 방법 및 장치

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